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车速观测是交通观测中最常规的一项内容。它对于交通管理与控制、事故分析、道路交通设施的改建以及交通规划等都有重要意义。车速观测要获得的数量指标有平均速度、均方差及各百分位车速(即车速分布)等几项,通常采取抽样观测方法。木文所要解决的问题是在一定抽样精度要求下,针对各目的指标确定抽样的最小次数。
Speed observation is the most common aspect of traffic observations. It is important for traffic management and control, accident analysis, reconstruction of road traffic facilities and traffic planning. The number of indicators to be obtained for speed observation are the average speed, the mean square error, and the speed of each percentile (ie, vehicle speed distribution). Several sampling methods are usually adopted. The problem that Mu Wen needs to solve is to determine the minimum number of sampling for each purpose index under certain sampling accuracy requirements.